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Bob Hutchinson
*nix forums addict
Joined: 10 Jan 2005
Posts: 76
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 Posted: Sun Feb 06, 2005 10:37 pm Post subject:
Re: help on Qmail Remote site (DR site).
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On Sunday 06 Feb 2005 00:14, R. Armiento wrote:
| Quote: | Thanks for the link to what appears to be a very capable POP/IMAP
proxy. However, perhaps I'm missing something here, but if you point
your clients towards a computer running this proxy server -- don't
that computer become a single point of failue? If I'm right, the proxy
server is more useful as a tool for load-balancing than for providing
a complete failover redundancy.
Yes and no
If you have multiple perdition that can talk to multiple pop/imap......
The point is - you have control of the failover - the client mua does
not have to do anything
Sorry, I still don't get this. Let's say you have three 'predition' IMAP
proxy servers, 'imap1.example.com', 'imap2.example.com', and
'imap3.example.com', acting proxy for a network of say 100 real IMAP
servers. One of your proxy servers goes offline, say 'imap1'. How do you
now make all clients that previously communicated with 'imap1' to now
start talking to either 'imap2' or 'imap3'?
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Dns. If all 3 have an equal mx distance, a decent dns will round-robin the
connections and if one goes down the others will just handle it instead.
IMHO
--
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Bob Hutchinson
Midwales dot com
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